... Material: Natural Rubber Concrete Pump Cleaning BallSponge Ball SpecificationsNameSponge Cleaning BallSize (mm)DN 50/80/100/125/150/180/200Size (inch)DN 2”/3”/4 ... ”/5”/6”/7”/8”TypeSoft, Medium Soft, FirmColorOrange, Yellow, Blue, Green, etc.ApplicationCleaning the pipeline of concrete pump and concrete pump ... , that'll be appreciated! Thanks.Kind regards,Daniel Qu Concrete Pump Cleaning Ball